Hi, I am a new Z-5500 user, and I have noticed some subwoffer humming.

I experience a low buzz/hum coming from the sub when the system is on (blue console led). It's clearly audible when no music is playing. It is still there when nothing is hooked up to the console, even in MUTE mode. I have examined it a bit and I am pretty sure this sound is made by the speaker itself (it's best heard from the subwoffer's front side). The does not get louder or softer with changes in the volume setting and there is no hiss from the satellites.

I have tried turning off the system, unplugging the console cable and re-plugging it in firmly but that doesn't seem to help.

The hum goes away when the unit is turned off via either the control pod or the switch on the back of the sub. In standby mode when I get closer with my ear to the sub I hear a bit if buzzing, from the inside, though it's much less noticeable than the buzzing when the system is on.

I have already tried changing the polarity, with no effect.

If there are any z-5500 users, please let me know, if you also suffer from this issue?

I'm having a similar problem; when my pc is on, the sub starts humming; when the pc is off, the humming stops. The z5500 is hooked up to my pc with the coax cable. The same problem with the dvd-player; as soon as i select optical as input(where my dvd-player is hooked upon) and I power on the dvd-player, the humming starts... The humming is independant of the volume of the speakers or of the output of the sub.

I have absolutely no clue what the problem can be. Is it a faulty set? Could it also be there is a problem with my power network, causing some kind of interference? I've had the z-680 before and they didn't give me this problem...

I'm also having this problem. I think the slight buzzing from the inside of the sub is the power transformer, but as for the humming, I have no idea . I am using an SB Extigy, which if connected using the 6-ch direct inputs, creates this awful hum. My DVD player does the same if connected to the digital coax input. The humming stops if I disconnect all electrical inputs, and just use the optical input. I don't think it's a problem with the speakers as I tried connecting my minidisc through one of the analog stereo inputs and it sounded great, no humming . I only experience the problem when connecting mains-powered devices to the speakers.

Have you guys tried bending around/tugging/pushing the main data connector going to the sub?

On my Z-5500 set I've noticed that where the cable meets the plug, if it's bent in a certain direction, I get a fairly audible buzzing from the sub. When I push on the cable (like pushing it into the plug), or bend it in a certain direction, the buzzing stops.

-------------------[Redemption and ar_cat talking about something dev-related]Redemption: What's the office rule? Howard is always right.Me: Hahaha. Can I quote that on my Neoseeker profile?Redemption: I'm right at least 70% of the time.

Yes, I tried moving the cable around last night and now the buzzing has stopped! If I just move the cable slightly, there's a thump from the sub. Do you know if this is a cable problem or just a bad connection with the socket? I really don't want a busted cable on my new speakers!

That's exactly what's happening to me. I move the cable around, and I get thumps. I haven't been able to pin-point the problem, but I believe it's the cable, or at least the point where the cable meets the connector.

I'm glad to see that I'm not the only one having this problem. Perhaps we should contact Logitech about it?

-------------------[Redemption and ar_cat talking about something dev-related]Redemption: What's the office rule? Howard is always right.Me: Hahaha. Can I quote that on my Neoseeker profile?Redemption: I'm right at least 70% of the time.

-------------------[Redemption and ar_cat talking about something dev-related]Redemption: What's the office rule? Howard is always right.Me: Hahaha. Can I quote that on my Neoseeker profile?Redemption: I'm right at least 70% of the time.

I've had a reply from Logitech although it doesn't help very much. They say it is an isolated case (although I told them a number of people are experiencing the problem). They said the connection may be lost under the strain of moving the cable, but it won't get any worse.Having had another look at my system, I think it is just a bad connection with the socket. I kept the cable still and just moved the plug very slightly and got the thumps. I then held the plug and moved the cable but didn't hear any thumps. It may be a loose pin or something. This may be the case with yours.

It's a similar case with mine. I've secured the plug extremely well, and tightened the screws as far as they'll go. The plug literally feels like a solid part of the subwoofer.

If I hold the plug, and move the cable around even slightly, I get the thumping/buzzing sound. It usually happens when the cable is in an "out" position (being pulled from the plug), but not when it's being pushed in.

I'll have a closer look today. It might just be a loose pin or something of the sort.

Thanks anyway.

-------------------[Redemption and ar_cat talking about something dev-related]Redemption: What's the office rule? Howard is always right.Me: Hahaha. Can I quote that on my Neoseeker profile?Redemption: I'm right at least 70% of the time.

Well, I figured out already it was a problem with the contact between the control pod cable and the sub. I tightened the screws a bit more and now the humming is gone. Just an occasional blob-sound from the sub, but i think i can live with it.

Ooh ... not an isolated case? So Logitech is aware that the connector makes less-than-optimal contact with the sub? Interesting ...

As I mentioned in my case, though, my connector is already tightened as much as humanly possible. I'll fidget around with it later today and figure out whether a pin is loose or something.

-------------------[Redemption and ar_cat talking about something dev-related]Redemption: What's the office rule? Howard is always right.Me: Hahaha. Can I quote that on my Neoseeker profile?Redemption: I'm right at least 70% of the time.

Had the same problem, decided to move the connection around to no effect, then removed the console connector from the sub (without switching the power off).... no more hum, no more power up - no more work!

-------------------[Redemption and ar_cat talking about something dev-related]Redemption: What's the office rule? Howard is always right.Me: Hahaha. Can I quote that on my Neoseeker profile?Redemption: I'm right at least 70% of the time.

Tightened the connection to the subwoofer.... and the hum reduced significantly, but was still audible. Decided to move the cable (attached to the connector, attached to the subwoofer) around, and bingo! Found a sweet spot where the hum ceased to exist. Taped the cable in place just to be certain!

FANTASTIC!!

The Logitech Z-5500 is connected to the digital tv set top box and produces outstanding quality sound.

Note to Guests: Advertising of any kind is not allowed in these forums!If you fix your problem on your own, please post a message describing how you fixed the issue so that others with a similar problem can use your method to fix their issue.